__init__.py 文件源码

def _GetCredentialForServiceAccount(json_keyfile, scopes, 
                                    credentials_filename=None):
    with open(json_keyfile, 'r') as json_keyfile_obj:
        client_credentials = json.load(json_keyfile_obj)
    credential_store = _GetCredentialStore(credentials_filename,
                                           client_credentials['private_key_id'],
                                           ' '.join(sorted(scopes)))
    credentials = credential_store.get()
    if credentials is None or credentials.invalid:
        credentials = (
            service_account.ServiceAccountCredentials.from_json_keyfile_dict(
                client_credentials, scopes=scopes))
        credential_store.put(credentials)
        credentials.set_store(credential_store)
    return credentials